Method for producing carbon-ceramic composite material

Abstract

Described herein is a method for producing a carbon-ceramic composite material, which is characterized by firing a ground powder mixture of low temperature coke and a ceramic material in a non-oxidizing atmosphere at a temperature higher than 800° C., inclusive, and lower than an inceptive sintering temperature of the ceramic material, prior to shaping and sintering stages.

What is claimed is: 
     
       1. A method for producing a high density high strength sintered carbon-ceramic composite material, consisting essentially of: a. heating a ground powder mixture consisting essentially of low-temperature coke and a ceramic material in a non-oxidizing atmosphere at a temperature higher than 800° C., inclusive, and lower than an inceptive sintering temperature of said ceramic material, and then   b. molding the powder mixture to shape and sintering.   
     
     
       2. The method of claim 1, wherein said composite material is composed of low-temperature coke and at least one ceramic material selected from the group consisting of carbides, borides, nitrides and oxides. 
     
     
       3. The method of claim 1, wherein the proportion of said ceramic material in said ground powder mixture is in the range of 10-90%. 
     
     
       4. The method of claim 1, wherein said ground powder mixture is molded to shape by injection molding, extrusion molding or ordinary molding. 
     
     
       5. The method of claim 4, wherein said ground powder mixture is molded by application of a low pressure of approximately 200 kg/cm 2 . 
     
     
       6. The method of claim 1, wherein a metal boride or boron carbide is added to said ground powder mixture. 
     
     
       7. The method of claim 1, wherein said low-temperature coke has a residual volatile content of greater than 4%. 
     
     
       8. The method of claim 7, wherein said low-temperature coke has a residual volatile content of 12%. 
     
     
       9. The method of claim 1, wherein said ground powder mixture comprises a mixture of low-temperature coke, SiC and B 4  C. 
     
     
       10. The method of claim 1, wherein said ground powder mixture further contains starch as a binder.